Find the longest Collatz chain below the input number

CollatzChainLength.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static uint CollatzNumber(uint number)
        {
            if (number % 2 == 0)
            {
                return number / 2;
            }
            return 1 + (number * 3);
        }

        static void Main(string[] args)
        {
            Dictionary<uint, uint> dictionary = new Dictionary<uint, uint>();
            uint chainlength = 0;
            uint maxchainlength = 0;
            uint startnumber = 0;
            uint maxnum = 0;

            Console.WriteLine("Enter max number");
            string input = Console.ReadLine();
            while (!uint.TryParse(input, out maxnum))
            {
                Console.WriteLine("Not a recognised number, try again");
                input = Console.ReadLine();
            }
            
            for(uint count = 0; count < maxnum; count++)
            {
                Console.Write("\r{0:F2}%: {1}  {2}    ", ((float)count / (float)maxnum) * 100.0f, count, maxchainlength);
                chainlength = 1;

                uint number = count;
                while (number > 1)
                {
                    if(dictionary.ContainsKey(number))
                    {
                        chainlength += dictionary[number];
                        number = 1;
                    }
                    else
                    {
                        chainlength++;
                        number = Program.CollatzNumber(number);
                    }
                }
                if(chainlength > maxchainlength)
                {
                    maxchainlength = chainlength;
                    startnumber = count;
                    dictionary.Add(count, chainlength);
                }
            }
            Console.Write("\r");
            Console.WriteLine("Longest chain under {0} is {1} generated by {2}", maxnum, chainlength, startnumber);
            Console.WriteLine("Press any key to quit");
            Console.ReadLine();
        }
    }
}